You are looking at the hydraulics when it is not locked, it all changes when the flow is reverse in lock up.
In lock-up, it goes like this:
The pump creates a vacuum drawing fluid into its inlet, and then displaces it to its outlet.
Next the pressure regulator valves restrict the flow up to the force if the spring required to move the valve into its regulating position generating and regulating line pressure.
Once the PR has built the desired line pressure, the extra pump volume goes into the converter charge (goes to the cooler in lock-up, by-passing the converter completely) until the desired pressure is reached (limited by the converter limit valve) and then it opens and dumps the rest on the slide reducing circuit reducing the pump volume output.
Both the line pressure solenoid and the TCC solenoid are fed AFL pressure. The actuator Feed Limit valve gets line pressure and pass it to the solenoids until it gets to110 psi. Once that is reached, it dumps the rest of the pump output volume to dump to ensure the pressure never goes above 110 psi to the solenoids.
The line pressure solenoid then outputs a certain % of its provided AFL feed based on the computer command to the boost valve which adds to the PR spring force raising line pressure.
The TCC solenoid output a % of its AFL feed as commanded by the computer to the TCC control valve and the TCC regulator valve.
Once the TCC solenoid output pressure is high enough to overcome the spring force of the TCC control valve, it strokes against its spring and reverse the flow in the converter.
Finally when the TCC solenoid output pressure is high enough to overcome the spring force if the TCC regulator valve, it sends fluid pressure into the 8apply path to apply the clutch in the converter.
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